Steoh



. (No Model.)

0. A. ROGKSTROH.

BOILER SGRAPER.

Patented Apr. 13, 1886.

UNITED STATES PATENT OFFICE.

CHARLES A. ROCKSTROH, OF BALTIMORE, MARYLAND.

BOiLER-SCRAPER.

SPECIFICATION forming part of Letters Patent No. 339,932, dated April 13, 1886.

Application filed ScptemberQS, 1885. Serial No.1T8,l-14. (No model.)

To all whom it may concern:

Be it known that I, CHARLES A. Roon- STROH, of the city of Baltimore and State of Maryland, have invented certain Improvements in Boiler-Scalers, of which the following is a specification.

This invention relates to devices for removing the scale from the tube or crown sheet of a boiler; and it consists in the applying to the tube-sheet of a series of scrapers and means to effect their reciprocation on the tubesheet, as will hereinafter fully appear.

In the drawings forming a part hereof, Figure I is a sectional elevation of the lower part of a vertical cylindrical tubular boiler provided with my invention. Fig. II is a crosssection of the same, taken on the dotted line 00 00, Fig. I.

In the said drawings, A. is the shell, and B the firebox, of the boiler.

O is the tube-sheet, and a a are the tubes.

D and Bare annular frames, placed one above the other and over the tubesheet C. These frames have bars I) and c, which extend between the tubes a, and it will be seen that the bars b are at a right angle with reference to the ones 0.

F and G are scrapers attached, respectively, to the bars I) and o, and they are of such Width as to occupy nearly the whole space between the tubes a. The frames D and E have handles d and e, which extend through stuffingboxes f and g to the exterior of the boiler.

It will be seen that by means of the handles (1 and e the frames D and E, with their scrapers, can be drawn back and forth, and an yscaie or other deposit on the tube-sheet removed.

I do not limit myself to the shape of the scrapers or to the means whereby they are fastened to the bars which support them, as shown and described.

IVith my invention the tubeshcet ofa boiler may be kept in a thoroughly-clean condition by the occasional movement of the scraping device.

I claim as my invention 1. In combination with the tube-sheet and the tubes of a boiler, a frame having bars which pass or extend between the tubes and projecting scrapers, and means to reciprocate the said device from the exterior of the boiler, substantially as specified.

2. In combination with the tube-sheet and the tubes of a boiler, the frames 1) and E, hav- CHARLES A. ROCKSTROH.

\Vitnesses:

DANL. FISHER, CHAS. W. ARNOLD. 

